Sectional hot top



Feb. 26, 1957 E. MARBURG 2,782,478

SECTIONAL HOT TOP Filed Sept. 8, 1955 2 Sheets-Sheet l IN V EN TOR.

5004/? MARBURG,

His Attorney.

Feb. 26, 1957 E. MARBURG 2,782,473

SECTIONAL HOT TOP Filed Sept. 8, 1953 2 Sheets-Sheet 2 IN VEN TOR. EDGARMARBURG,

His Attorney.

SECTIONAL HOT TOP Edgar Marburg, Pittsburgh, Pa., assignor to UnitedStates Steel Corporation, a corporation of New Jersey ApplicationSeptember 8, 1953, Serial No. 378,921

6 Claims. (Cl. 22-147) This invention relates to a sectional hot top foringot molds and is an improvement to the hot top shown in my priorPatent No. 2,444,838, dated July 6, 1948. The construction of theinterlocking wedge surfaces in my prior patent is such that the sideslabs are not substantially rectangular, whereas it is desirable thatthey should be. The width of the joint faces between the slabs decreasesupwardly and the lower portions of the slabs are thinner than the upperportions. Since the danger of nited States Patent leakage of the hotmetal from the hot top is greater at i the top than at the bottom it isdesirable to have the joint faces wider at the top rather than at thebottom. Also the slabs do not have their inner surfaces arrangedvertically. Since big-end-up ingots are grasped by the sinkhead portionin stripping, or removing them from the mold, it is desirable that thesesides be vertical. Vertical sides also facilitate calculation of thevolume of metal in the hot top. It is likewise desirable to have theinner lower face of each of the slabs rounded in order to obtain aningot more suitable for rolling since a square shoulder has a tendencyto lap, or roll back on the ingot. However, this is not feasible withthe hot top shown in my prior patent.

It is an object of my invention to provide a sectional hot top which iseasily removable from the ingot and which is so shaped that the ingotcan be readily stripped from the mold and the volume of metal in the hottop can be easily calculated.

Another object is to provide a hot top which is easier to make andassemble than the hot top disclosed in my above mentioned patent.

Still another object is to provide a sectional hot top the bottom ofwhich is in intimate contact with the mold and in which leakage of hotmetal through the vertical joints thereof is less than in my patentedhot top.

These and other objects will be more apparent after referring to thefollowing specification and attached drawings, in which:

Figure 1 is a top plan view of the hot top in place on amold;

Figure 2 is a sectional view taken on the line II-II of Figure 1;

Figure 3 is a sectional view taken on the line IIIIII of Figure 1;

Figure 4 is a top plan view of the side slabs in place on a mold shownin broken lines;

Figure 5 is a perspective view of a side slab showing the outer facethereof;

Figure 6 is a perspective view showing the inner face of the side slabof Figure 5;

Figure 7 is a perspective view of an end slab showing the outer facethereof;

Figure 8 is a perspective view showing the inner face of the end slab ofFigure 7.

Referring more particularly to the drawings, the refer enee numeral 2indicates the top of a corrugated ingot mold in which the hot top of myinvention is installed. The hot top consists of two side slabs 4 and twoend slabs 2,782,478 Patented Feb. 26, 1957 ICE 6. The lower outersurface of each of the side slabs 4 has vertical corrugations 8 thereonwhich match the corrugations of the mold. The outer surface of each ofthe side slabs has a depression 10 therein. Two rows of verticallyspaced holes 12 are arranged in the outer surface of each slab 4 forreceiving straight support rods 14. The inner surface 16 of each slab 4is flat and is wider at the bottom than at the top so as to form a wedgesurface 18 on each end thereof. A flange 20 extends from each endsurface and has an inwardly facing wedge surface 22 thereon. Each of theslabs 4 is slightly thicker at the bottom than at the top and has arounded inner lower edge 24.

Each of the end slabs 6 has vertical corrugations 26 on its lower outersurface which match the corrugations of the mold 2. Each of the slabs 6has a depression 28 in its outer surface which in some instances isprovided with a narrow vertical rib 30 which will contact the side ofthe mold and prevent the top of the slab from being pushed back andallowing leakage at the vertical joints. The outer surf-ace of each ofthe slabs 6 is wider at the top than at the bottom so as to form a wedgesurface 32 on the ends of the slab. An inwardly facing wedge surface 34is provided at each end of the slab 6. An inwardly extending verticalshoulder 36 is provided on the slab 6 adjacent each of the wedgesurf-aces 34. Each of the slabs 6 is considerably thicker at the bottomthan at the top and has a rounded inner lower edge 38.

In assembling a hot top on the mold a rod 14 is placed in one of theholes 12 at one end of each of the slabs 4 and a second rod 14 is placedin a corresponding hole 12 at the opposite end of the slabs. The holesin which the rods 14 are placed are selected in accordance with thedepth it is desired to have the slab extend downwardly into the mold 2.The slabs 4 are placed in position on opposite sides of the mold andsupported from the top of the mold by means of the rods 14. The ends ofthe slabs 6 are then placed in the space between the side slabs 4 in themold. The wedge surfaces 18 of slabs 4 will contact the wedge surfaces34 of slabs 6 and the wedge surfaces 22 of slabs 4 will contact wedgesurfaces 32 of slabs 6 to wedge all the slabs in place in the mold withtheir lower surfaces 8 and 26 contacting the mold walls. It will benoted that the width of the inner surface of each of the slabs 4 at thebottom of the slabs is equal to the corresponding inside width of themold minus twice the thickness of the second pair of slabs 6 at thebottom of the wedge surface 32.

While slabs 4 have been termed side slabs and slabs 6 end slabs, thishas no relationship to the relative widths of the slabs since the sideslabs 4 may be either wider or narrower than the slabs 6. In eachinstance, however, the side slabs will be the slabs which are supportedon the mold. While the slabs are shown having a flat inner surface and arecess on the outer surface, the recesses may be provided on the innersurfaces of the end slabs and/ or side slabs. By arranging the recesseson the inside of the sinkhead volume is increased. The shape of thesinkhead can be varied within limits by selecting the desiredarrangement of the recesses in the slabs and thickness of slabs. In thismanner, even in an oblong mold, a square sinkhead can be obtained, thisbeing the most desirable shape.

While one embodiment of my invention has been shown and described itwill be apparent that other adaptations and modifications may be madewithout departing from the scope of the following claims.

I claim:

1. A sectional hot top for a mold comprising a pair of slabs ofrefractory material, the inner surface of each of said slabs beingsubstantially wider at the bottom than at the top to form a wedgesurface on each end of the slab, said wedge surface being substantiallywider at the top than at the bottom, a flange extending from each endsurface and having an inwardly facing wedge surface thereon, said lastnamed wedge surface being of substantial width at the top thereof, meansfor supporting the slabs in spaced apart relationship on the mold withtheir lower portions contacting the inner surface of the mold and withspaces between adjacent ends of the slabs, the distance between theinwardly facing wedge surfaces of opposite slabs being greater at thetop than at the bottom, a second pair of slabs of refractory materialone located in each of said spaces, the outer surface of each of saidsecond pair of slabs being substantially wider at the top than at thebottom to form a wedge surface on the ends of the slab, said last namedwedge surface being of substantial width at the top thereof, said lastnamed wedge surfaces contacting the second wedge surfaces on the firstpair of slabs, and an inwardly facing wedge surface on each end of thesecond pair of slabs contacting the first wedge surfaces on the firstpair of slabs, said last named wedge surface being substantially widerat the top than at the bottom. 3

2. A sectional hot top according to claim 1 in which each of said secondpair of slabs has an inwardly extending vertical shoulder adjacent eachof its inwardly facing wedge surfaces adapted to contact the innersurface of the first pair of slabs when in assembled position.

3. A sectional hot top according to claim 2 in which each of said slabsis thicker at the bottom than at the top and in which the inner loweredge of each slab is rounded.

4. A sectional hot top for a rectangular corrugated mold comprising apair of slabs of refractory material, the inner surface of each of saidslabs being substantially wider at the bottom than at the top to form awedge surface on each end of the slab, said wedge surface beingsubstantially wider at the top than at the bottom, a flange extendingfrom each end surface and having an inwardly facing wedge surfacethereon, said last named wedge surface being of substantial width at thetop thereof, means for supporting the slabs in spaced apart relationshipon opposite sides of the mold with their lower portions contacting theinner surface of the mold and with spaces between adjacent ends of theslabs, the distance between the inwardly facing wedge surfaces ofopposite slabs being greater at the top than at the bottom, a secondpair of slabs of refractory material one located in each of said spaces,the outer surface of each of said second pair of slabs beingsubstantially wider at the top than at the bottom to form a wedgesurface on the ends of the slab, said last named wedge surface being ofsubstantial width at the top thereof, said last named wedge surfacescontacting the second wedge surfaces on the first pair of slabs, aninwardly facing wedge surface on each end of the second pair of slabscontacting the first wedge surfaces on the first pair of slabs, saidlast named wedge surface being substantially wider at the top than atthe bottom, the lower outer surface of each of said slabs havingvertical corrugations thereon to match the corrugations of said mold, atleast one pair of said slabs having a depression in their outer surfaceand a narrow vertical rib in said depression.

5. A sectional hot top according to claim 4 in which each of said secondpair of slabs has, an inwardly extending vertical shoulder adjacent eachof its inwardly facing wedge surfaces adapted to contact the innersurface of the first pair of slabs when in assembled position.

6. A sectional hot top according to claim 5 in which each of said slabsis thicker at the bottom than at the top and in which the inner loweredge of each slab is rounded.

References Cited in the file of this patent UNITED STATES PATENTS

